docs: def fix_lockfile(self):
          """Run each line of outfile through fix_pin"""
          with open(self.outfile, 'rt') as fp:
              lines = [
                  self.fix_pin(line)
                  for line in self.concatenated(fp)
              ]
          with open(self.outfile, 'wt') as fp:
              fp.writelines([
                  line + '\n'
                  for line in lines
                  if line is not None
              ])